The equilibrium geometry of C_(74) has been studied by density functional theory (DFT) at the BLYP method and 3-21G~* level and the UV-vis spectrum of C_(74) is examined using semiempirical ZINDO and ab initio CIS methods. The results shows that there is absorption at infrared band. On the basis of correct electronic spectra, calculations of the nonlinear third-order optical susceptibility of C_ (74) are performed. The calculated value of <γ> is 1.483 * 10~(-32) esu, which is bigger than C_(60) (8.84 * 10~(-34) esu).

Key words: CONFIGURATION, ELECTRON SPECTROSCOPY, NON LINEAR OPTICS, MAGNETIC MATERIALS, CARBON74